fontimpl.h

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// $Id: fontimpl.h 853 2006-04-21 12:32:46Z luke $
// $Id: fontimpl.h 853 2006-04-21 12:32:46Z luke $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

This file is part of Xara LX.

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under the terms of the GNU General Public License version 2 as published
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Franklin St, Fifth Floor, Boston, MA  02110-1301 USA


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-----------------

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The additional rights are to use, modify, and distribute the software
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=================================XARAHEADEREND============================
 */

// Implementation-specific definitions for fontbase.cpp. Not meant to
// included by any other file.

#include "fontbase.h"
#include <map>

/********************************************************************************************
>   class FontMetricsCacheEntry : public CC_CLASS_MEMDUMP
            
    Author:     Ed_Cornes (Xara Group Ltd) <camelotdev@xara.com>
    Created:    14/1/96
    Purpose:    Holds a cache of char widths, ascent, descent and em for a particular font.
********************************************************************************************/

class FontMetricsCacheEntry: public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(FontMetricsCacheEntry);
    
public:
    FontMetricsCacheEntry();

    BOOL CacheFontMetrics(wxDC* pDC, CharDescription FontDesc, MILLIPOINT DefaultHeight, INT32 DesignSize);

    void CheckCharWidthsSameAsABCWidths(wxDC* pDC, CharDescription FontDesc);   // debug test

    inline static BOOL CharInCacheRange(WCHAR ch) { return (ch>=FIRSTCHAR && ch<=LASTCHAR); }

    inline INT32 GetCharWidthFromCache(WCHAR ch) { return pCharWidths[ch-FIRSTCHAR]; }

    inline MILLIPOINT      GetFontEmWidth() { return FontEmWidth; }
    inline MILLIPOINT      GetFontAscent()  { return FontAscent; }
    inline MILLIPOINT      GetFontDescent() { return FontDescent; }
    inline CharDescription GetFontDesc()    { return FontDesc; }

    inline void SetFontEmWidth(MILLIPOINT NewFontEmWidth) { FontEmWidth = NewFontEmWidth; }
    inline void SetFontAscent( MILLIPOINT NewFontAscent)  { FontAscent  = NewFontAscent; }
    inline void SetFontDescent(MILLIPOINT NewFontDescent) { FontDescent = NewFontDescent; }
    inline void SetFontDesc(CharDescription NewFontDesc)  { FontDesc    = NewFontDesc; }

protected:
    // this seems the only way to define constants in a class assigning values
    enum CharRange { FIRSTCHAR=32, LASTCHAR=127, NUMCHARS=(LASTCHAR-FIRSTCHAR+1) };

    MILLIPOINT pCharWidths[NUMCHARS];
    MILLIPOINT FontEmWidth;
    MILLIPOINT FontAscent;
    MILLIPOINT FontDescent;
    CharDescription FontDesc;
};

/********************************************************************************************
>   class FontMetricsCache : public CC_CLASS_MEMDUMP
            
    Author:     Ed_Cornes (Xara Group Ltd) <camelotdev@xara.com>
    Created:    14/1/96
    Purpose:    Holds a cache of char widths, ascent, descent and em for a particular font.
********************************************************************************************/

class FontMetricsCache: public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(FontMetricsCache);
    
public:
    static void InvalidateCharMetrics();
    static BOOL GetCharMetrics(wxDC* pDC, WCHAR ch, CharDescription& FontDesc, CharMetrics* pCharMetrics);

protected:
    // this seems the only way to define constants in a class assigning values
    enum CacheInfo { NUMENTRIES=3 };

    static FontMetricsCacheEntry mpFontMetricsData[NUMENTRIES];
};


/********************************************************************************************

>   class CharOutlineCache : public CC_CLASS_MEMDUMP
            
    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    14/9/95
    Purpose:    A cache for a character outline. This cache can only be accessed via the
                OILFontMan character outline calls

********************************************************************************************/

class CharOutlineCache : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(CharOutlineCache);
    
    friend class OILFontMan;
    
    private:
        #if _DEBUG
        static void Dump();
        #endif

        static DocCoord CacheCoords[OILFONTLIMIT];
        static PathVerb CacheVerbs[OILFONTLIMIT];
        static UINT32 CacheSize;
        static DocCoord LastMoveTo;
};

// Forward decleration
struct MillipointKerningPair;

/********************************************************************************************
>   class FontKerningPairsCacheEntry : public CC_CLASS_MEMDUMP
            
    Author:     Jonathan_Payne (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/10/2000
    Purpose:    Holds a cache of kerning pairs for a font
********************************************************************************************/

class FontKerningPairsCacheEntry : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(FontKerningPairsCacheEntry);
    
public:
    FontKerningPairsCacheEntry();       // constructor
    ~FontKerningPairsCacheEntry();      // destructor

    void Reinitialise(CharDescription& NewFontDesc);

    MILLIPOINT GetCharsKerning(WCHAR chLeft, WCHAR chRight);
    inline CharDescription GetFontDesc()                    { return FontDesc; }
    inline void SetFontDesc(CharDescription NewFontDesc)    { FontDesc = NewFontDesc; }

#ifdef _DEBUG
public:
    void Dump();
#endif //_DEBUG

protected:
    CharDescription FontDesc;

protected: // Kerning data
    std::map<UINT32,INT32>* m_pPairsCacheMap;

private:
    // declare private copy constructor and assignment operator to prevent
    // copy/assignment operations - the methods are not implemented
    FontKerningPairsCacheEntry(const FontKerningPairsCacheEntry&);
    FontKerningPairsCacheEntry& operator=(const FontKerningPairsCacheEntry&);
};


/********************************************************************************************

>   class FontKerningPairsCache : public CC_CLASS_MEMDUMP
            
    Author:     Jonathan_Payne (Xara Group Ltd) <camelotdev@xara.com>
    Created:    16/10/2000
    Purpose:    A cache for the kerning pairs for a font

********************************************************************************************/

class FontKerningPairsCache : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(FontKerningPairsCache);
    
public:
    static MILLIPOINT GetCharsKerning(wxDC* pDC, WCHAR chLeft, WCHAR chRight,
                                      CharDescription& FontDesc);

#ifdef _DEBUG
public:
    static void Dump();
#endif//_DEBUG

protected:
    // this seems the only way to define constants in a class assigning values
    enum CacheInfo { NUMENTRIES=3 };

    static FontKerningPairsCacheEntry m_FontKerningPairsCacheData[NUMENTRIES];
};

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